B-Vents Only; Spill Switch Circuit Faulty - Travis Industries Spirit 300 GS Service Manual

Spill Switch Circuit Faulty

B-Vents Only

The spill switch circuit disables the
heater if spillage is detected from
the draft hood. If a connection
between the components is loose,
corroded, or damaged, the circuit
will be disabled and the pilot will not
stay lit when the gas control knob is
released. To check the spill switch
circuit, follow the directions below.
1 Start the pilot and hold down
the gas control knob. Ground
one of the multimeter probes to
the copper tube on the
thermocouple connector.
2 Use a multimeter to measure
the millivolt reading on the spill
switch interrupt terminal
nearest the thermocouple
connector. If no millivolts are
detected, and the
thermocouple is producing
millivolts (see "Thermocouple
Defective" pg. 2-4), the
thermocouple connector is not
attached correctly.
3 Replace the spill switch wire nearest the thermocouple connector and measure the millivolt
reading on the other terminal of the spill switch interrupt. If no millivolts are detected, and
millivolts were detected in step 2 above, the spill switch wires or spill switch snap disk is faulty
(see steps 4 & 5 below). If millivolts are detected (minimum of 15 millivolts), yet the pilot does not
stay lit, the spill switch interrupt is not attached to the gas control valve correctly.
4 Carefully Inspect the spill switch
wires for damage or loose
connections. If the wire
insulation is melted and the
wire contacts a metal surface,
the thermocouple circuit will
ground out to the chassis of
the heater and disable the
heater. Replace damaged wire.
5 Remove the rear panel of the
heater (if applicable) to access
the spill switch. Remove the
two red wires leading to the spill
switch and check for continuity
on the spill switch. Replace if
no continuity is detected.
Remedy
Replace or repair the appropriate
component based upon the above
troubleshooting steps.
Travis Industries
Troubleshooting Steps
Gas T-Shoot Guide
Thermocouple
Connector
2
Spill Switch Wires (Red)
Orientation does not matter
when re-connecting.
1
PILOT ADJ
Spill Switch Interrupt
3
Spill Switch Wires (Red)
Orientation does not matter
when re-connecting
Draft Hood
Spill
Switch
2 - 5
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